Re: PG bottlenecks

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On 3/25/19 10:24 AM, Rafał Wądołowski wrote:
> Hi,
> On one of our cluster (3400 OSD, ~25PB, 12.2.4), we incremented pg_num &
> pgp_num on one pool (EC 4+2) from 32k to 64k. After that cluster started
> to be instable for one hour, pgs were inactive (some activating, some
> peering).
> Any idea what bottlenecks we hit? Any ideas what should I change in
> configuration of ceph/os ?


For such cases (PG increase) we usually do it in multiple steps for both
pg_num and pgp_num waiting for cluster to reach all PG active state
after each increase. However we work on replicated pools only.

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